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Published: 02/09/2020 Updated: 11/09/2020

CVSS v2 Base Score: 10 | Impact Score: 10 | Exploitability Score: 10

CVSS v3 Base Score: 9.8 | Impact Score: 5.9 | Exploitability Score: 3.9

VMScore: 890

Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C

Zyxel VMG5313-B30B router on firmware 5.13(ABCJ.6)b3_1127, and possibly older versions of firmware are affected by insecure permissions which allows regular and other users to create new users with elevated privileges. This is done by changing "FirstIndex" field in JSON that is POST-ed during account creation. Similar may also be possible with account deletion.

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zyxel vmg5313-b30b_firmware

CWE-732 https://www.zyxel.com/support/security_advisories.shtml https://blog.somegeneric.ninja/Zyxel_VMG5153_B30B_part2 https://blog.somegeneric.ninja/Zyxel_VMG5153_B30B https://nvd.nist.gov

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CVE-2020-24355

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